button grass noun1 •(Australia) Any of several grasses with round or globular flower heads; especially Gymnoschoenus sphaerocephalus, a tussock-forming sedge especially of western Tasmania, forming distinct plains; and Dactyloctenium radulans, an annual grass of mainland Australia.[T]he ceiling swelled in waves like an ocean, like a buttongrass plain, like the pocked earth stripped of its trees […]. — 1997
